FastAPI and Pydantic RecursionError Causing Exception in ASGI application
Question:
Description
I’ve seen similar issues about self-referencing Pydantic models causing RecursionError: maximum recursion depth exceeded in comparison but as far as I can tell there are no self-referencing models included in the code. I’m just just using Pydantic’s BaseModel class.
The code runs successfully until the function in audit.py below tries to return the output from the model.
I’ve included the full traceback as I’m not sure where to begin with this error. I’ve run the code with PyCharm and without an IDE and it always produces the traceback below but doesn’t crash the app but returns a http status code of 500 to the front end.
Any advice would be much appreciated.
As suggested I have also tried sys.setrecursionlimit(1500) to increase the recursion limit.
Environment
- OS: Windows 10
- FastAPI Version: 0.61.1
- Pydantic Version: 1.6.1
- Uvicorn Version: 0.11.8
- Python Version: 3.7.1
- Pycharm Version: 2020.2
App
main.py
import uvicorn
from fastapi import FastAPI
from starlette.middleware.cors import CORSMiddleware
from app.api.routes.router import api_router
from app.core.logging import init_logging
from app.core.config import settings
init_logging()
def get_app() -> FastAPI:
application = FastAPI(title=settings.APP_NAME, version=settings.APP_VERSION, debug=settings.DEBUG)
if settings.BACKEND_CORS_ORIGINS:
# middleware support for cors
application.add_middleware(
CORSMiddleware,
allow_origins=[str(origin) for origin in settings.BACKEND_CORS_ORIGINS],
allow_credentials=True,
allow_methods=["*"],
allow_headers=["*"],
)
application.include_router(api_router, prefix=settings.API_V1_STR)
return application
app = get_app()
if __name__ == "__main__":
uvicorn.run("main:app", host="127.0.0.1", port=80)
router.py
from fastapi import APIRouter
from app.api.routes import audit
api_router = APIRouter()
api_router.include_router(audit.router, tags=["audit"], prefix="/audit")
audit.py
import validators
from fastapi import APIRouter, HTTPException
from loguru import logger
from app.api.dependencies.audit import analyzer
from app.schemas.audit import AuditPayload, AuditResult
router = APIRouter()
@router.post("/", response_model=AuditResult, name="audit", status_code=200)
async def post_audit(payload: AuditPayload) -> AuditResult:
logger.info("Audit request received")
# validate URL
try:
logger.info("Validating URL")
validators.url(payload.url)
except HTTPException:
HTTPException(status_code=404, detail="Invalid URL.")
logger.exception("HTTPException - Invalid URL")
# generate output from route audit.py
logger.info("Running audit analysis. This could take up to 10 minutes. Maybe grab a coffee...")
analyzed_output = analyzer.analyze(url=payload.url,
brand=payload.brand,
twitter_screen_name=payload.twitter_screen_name,
facebook_page_name=payload.facebook_page_name,
instagram_screen_name=payload.instagram_screen_name,
youtube_user_name=payload.youtube_user_name,
ignore_robots=payload.ignore_robots,
ignore_sitemap=payload.ignore_sitemap,
google_analytics_view_id=payload.google_analytics_view_id)
output = AuditResult(**analyzed_output)
return output
audit_models.py
from pydantic import BaseModel
class AuditPayload(BaseModel):
url: str
brand: str
twitter_screen_name: str
facebook_page_name: str
instagram_screen_name: str
youtube_user_name: str
ignore_robots: bool
ignore_sitemap: bool
google_analytics_view_id: str
class AuditResult(BaseModel):
base_url: str
run_time: float
website_404: dict
website_302: dict
website_h1_tags: dict
website_duplicate_h1: dict
website_h2_tags: dict
website_page_duplications: dict
website_page_similarities: dict
website_page_desc_duplications: dict
website_page_title_duplications: dict
pages: list
pages_out_links_404: dict = None
pages_canonicals: dict
seo_phrases: dict
social: dict
google_analytics_report: dict
google_psi_desktop: dict
google_psi_mobile: dict
google_algo_updates: dict
google_sb: list
robots_txt: list
This line throws the error in the logs:
2020-09-10 10:02:31.483 | ERROR | uvicorn.protocols.http.h11_impl:run_asgi:391 – Exception in ASGI application
I believe this bit is the most relevant to understanding why this error is occuring:
File "pydanticmain.py", line 623, in pydantic.main.BaseModel._get_value
[Previous line repeated 722 more times]
Full traceback:
Traceback (most recent call last):
File "C:Users<user>AppDataLocalJetBrainsToolboxappsPyCharm-Pch-0202.6948.78pluginspythonhelperspydevpydevconsole.py", line 483, in <module>
pydevconsole.start_client(host, port)
│ │ │ └ 50488
│ │ └ '127.0.0.1'
│ └ <function start_client at 0x000001BCEDC19D08>
└ <module 'pydevconsole' from 'C:\Users\<user>\AppData\Local\JetBrains\Toolbox\apps\PyCharm-P\ch-0\202.6948.78\pl...
File "C:Users<user>AppDataLocalJetBrainsToolboxappsPyCharm-Pch-0202.6948.78pluginspythonhelperspydevpydevconsole.py", line 411, in start_client
process_exec_queue(interpreter)
│ └ <_pydev_bundle.pydev_ipython_console.InterpreterInterface object at 0x000001BCEDC1BF98>
└ <function process_exec_queue at 0x000001BCEDC19A60>
File "C:Users<user>AppDataLocalJetBrainsToolboxappsPyCharm-Pch-0202.6948.78pluginspythonhelperspydevpydevconsole.py", line 258, in process_exec_queue
more = interpreter.add_exec(code_fragment)
│ │ └ <_pydev_bundle.pydev_console_types.CodeFragment object at 0x000001BCEDCFE748>
│ └ <function BaseCodeExecutor.add_exec at 0x000001BCECF38488>
└ <_pydev_bundle.pydev_ipython_console.InterpreterInterface object at 0x000001BCEDC1BF98>
File "C:Users<user>AppDataLocalJetBrainsToolboxappsPyCharm-Pch-0202.6948.78pluginspythonhelperspydev_pydev_bundlepydev_code_executor.py", line 106, in add_exec
more = self.do_add_exec(code_fragment)
│ │ └ <_pydev_bundle.pydev_console_types.CodeFragment object at 0x000001BCEDCFE748>
│ └ <function InterpreterInterface.do_add_exec at 0x000001BCEDC15D90>
└ <_pydev_bundle.pydev_ipython_console.InterpreterInterface object at 0x000001BCEDC1BF98>
File "C:Users<user>AppDataLocalJetBrainsToolboxappsPyCharm-Pch-0202.6948.78pluginspythonhelperspydev_pydev_bundlepydev_ipython_console.py", line 36, in do_add_exec
res = bool(self.interpreter.add_exec(code_fragment.text))
│ │ │ │ └ "runfile('E:/Users/<user>/Documents/GitHub/HawkSense/backend/app/app/main.py', wdir='E:/Users/<user>/Docume...
│ │ │ └ <_pydev_bundle.pydev_console_types.CodeFragment object at 0x000001BCEDCFE748>
│ │ └ <function _PyDevFrontEnd.add_exec at 0x000001BCEDC15A60>
│ └ <_pydev_bundle.pydev_ipython_console_011._PyDevFrontEnd object at 0x000001BCEDC350B8>
└ <_pydev_bundle.pydev_ipython_console.InterpreterInterface object at 0x000001BCEDC1BF98>
File "C:Users<user>AppDataLocalJetBrainsToolboxappsPyCharm-Pch-0202.6948.78pluginspythonhelperspydev_pydev_bundlepydev_ipython_console_011.py", line 483, in add_exec
self.ipython.run_cell(line, store_history=True)
│ │ │ └ "runfile('E:/Users/<user>/Documents/GitHub/HawkSense/backend/app/app/main.py', wdir='E:/Users/<user>/Docume...
│ │ └ <function InteractiveShell.run_cell at 0x000001BCED5E7268>
│ └ <_pydev_bundle.pydev_ipython_console_011.PyDevTerminalInteractiveShell object at 0x000001BCEDC350F0>
└ <_pydev_bundle.pydev_ipython_console_011._PyDevFrontEnd object at 0x000001BCEDC350B8>
File "C:Program FilesPython37libsite-packagesIPythoncoreinteractiveshell.py", line 2843, in run_cell
raw_cell, store_history, silent, shell_futures)
│ │ │ └ True
│ │ └ False
│ └ True
└ "runfile('E:/Users/<user>/Documents/GitHub/HawkSense/backend/app/app/main.py', wdir='E:/Users/<user>/Docume...
File "C:Program FilesPython37libsite-packagesIPythoncoreinteractiveshell.py", line 2869, in _run_cell
return runner(coro)
│ └ <generator object InteractiveShell.run_cell_async at 0x000001BCEDC49C78>
└ <function _pseudo_sync_runner at 0x000001BCED5D0C80>
File "C:Program FilesPython37libsite-packagesIPythoncoreasync_helpers.py", line 67, in _pseudo_sync_runner
coro.send(None)
│ └ <method 'send' of 'generator' objects>
└ <generator object InteractiveShell.run_cell_async at 0x000001BCEDC49C78>
File "C:Program FilesPython37libsite-packagesIPythoncoreinteractiveshell.py", line 3044, in run_cell_async
interactivity=interactivity, compiler=compiler, result=result)
│ │ └ <ExecutionResult object at 1bcedcd3470, execution_count=2 error_before_exec=None error_in_exec=None info=<ExecutionInfo objec...
│ └ <IPython.core.compilerop.CachingCompiler object at 0x000001BCEDC356D8>
└ 'last_expr'
File "C:Program FilesPython37libsite-packagesIPythoncoreinteractiveshell.py", line 3215, in run_ast_nodes
if (yield from self.run_code(code, result)):
│ │ │ └ <ExecutionResult object at 1bcedcd3470, execution_count=2 error_before_exec=None error_in_exec=None info=<ExecutionInfo objec...
│ │ └ <code object <module> at 0x000001BCEDCDADB0, file "<ipython-input-2-086756a0f1dd>", line 1>
│ └ <function InteractiveShell.run_code at 0x000001BCED5E76A8>
└ <_pydev_bundle.pydev_ipython_console_011.PyDevTerminalInteractiveShell object at 0x000001BCEDC350F0>
File "C:Program FilesPython37libsite-packagesIPythoncoreinteractiveshell.py", line 3291, in run_code
exec(code_obj, self.user_global_ns, self.user_ns)
│ │ │ │ └ {'__name__': 'pydev_umd', '__doc__': 'Automatically created module for IPython interactive environment', '__package__': None,...
│ │ │ └ <_pydev_bundle.pydev_ipython_console_011.PyDevTerminalInteractiveShell object at 0x000001BCEDC350F0>
│ │ └ <property object at 0x000001BCED5D8958>
│ └ <_pydev_bundle.pydev_ipython_console_011.PyDevTerminalInteractiveShell object at 0x000001BCEDC350F0>
└ <code object <module> at 0x000001BCEDCDADB0, file "<ipython-input-2-086756a0f1dd>", line 1>
File "<ipython-input-2-086756a0f1dd>", line 1, in <module>
runfile('E:/Users/<user>/Documents/GitHub/HawkSense/backend/app/app/main.py', wdir='E:/Users/<user>/Documents/GitHub/HawkSense/backend/app/app')
File "C:Users<user>AppDataLocalJetBrainsToolboxappsPyCharm-Pch-0202.6948.78pluginspythonhelperspydev_pydev_bundlepydev_umd.py", line 197, in runfile
pydev_imports.execfile(filename, global_vars, local_vars) # execute the script
│ │ │ │ └ {'__name__': '__main__', '__doc__': "nMain entry point into API for endpoints related to HawkSense's main functionality.nto...
│ │ │ └ {'__name__': '__main__', '__doc__': "nMain entry point into API for endpoints related to HawkSense's main functionality.nto...
│ │ └ 'E:/Users/<user>/Documents/GitHub/HawkSense/backend/app/app/main.py'
│ └ <function execfile at 0x000001BCECC521E0>
└ <module '_pydev_bundle.pydev_imports' from 'C:\Users\<user>\AppData\Local\JetBrains\Toolbox\apps\PyCharm-P\ch-0\...
File "C:Users<user>AppDataLocalJetBrainsToolboxappsPyCharm-Pch-0202.6948.78pluginspythonhelperspydev_pydev_imps_pydev_execfile.py", line 18, in execfile
exec(compile(contents+"n", file, 'exec'), glob, loc)
│ │ │ └ {'__name__': '__main__', '__doc__': "nMain entry point into API for endpoints related to HawkSense's main functionality.nto...
│ │ └ {'__name__': '__main__', '__doc__': "nMain entry point into API for endpoints related to HawkSense's main functionality.nto...
│ └ 'E:/Users/<user>/Documents/GitHub/HawkSense/backend/app/app/main.py'
└ '#!/usr/bin/env pythonnn"""nMain entry point into API for endpoints related to HawkSense's main functionality.ntodo: htt...
File "E:/Users/<user>/Documents/GitHub/HawkSense/backend/app/appmain.py", line 47, in <module>
uvicorn.run("main:app", host="127.0.0.1", port=80) # for debug only
│ └ <function run at 0x000001BCEDE041E0>
└ <module 'uvicorn' from 'C:\Program Files\Python37\lib\site-packages\uvicorn\__init__.py'>
File "C:Program FilesPython37libsite-packagesuvicornmain.py", line 362, in run
server.run()
│ └ <function Server.run at 0x000001BCEDE4B510>
└ <uvicorn.main.Server object at 0x000001BCFC722198>
File "C:Program FilesPython37libsite-packagesuvicornmain.py", line 390, in run
loop.run_until_complete(self.serve(sockets=sockets))
│ │ │ │ └ None
│ │ │ └ <function Server.serve at 0x000001BCEDE4B598>
│ │ └ <uvicorn.main.Server object at 0x000001BCFC722198>
│ └ <function BaseEventLoop.run_until_complete at 0x000001BCED49FE18>
└ <_WindowsSelectorEventLoop running=True closed=False debug=False>
File "C:Program FilesPython37libasynciobase_events.py", line 560, in run_until_complete
self.run_forever()
│ └ <function BaseEventLoop.run_forever at 0x000001BCED49FD90>
└ <_WindowsSelectorEventLoop running=True closed=False debug=False>
File "C:Program FilesPython37libasynciobase_events.py", line 528, in run_forever
self._run_once()
│ └ <function BaseEventLoop._run_once at 0x000001BCED4A27B8>
└ <_WindowsSelectorEventLoop running=True closed=False debug=False>
File "C:Program FilesPython37libasynciobase_events.py", line 1764, in _run_once
handle._run()
│ └ <function Handle._run at 0x000001BCED43AB70>
└ <Handle <TaskStepMethWrapper object at 0x000001BCFC7D4B00>()>
File "C:Program FilesPython37libasyncioevents.py", line 88, in _run
self._context.run(self._callback, *self._args)
│ │ │ │ │ └ <member '_args' of 'Handle' objects>
│ │ │ │ └ <Handle <TaskStepMethWrapper object at 0x000001BCFC7D4B00>()>
│ │ │ └ <member '_callback' of 'Handle' objects>
│ │ └ <Handle <TaskStepMethWrapper object at 0x000001BCFC7D4B00>()>
│ └ <member '_context' of 'Handle' objects>
└ <Handle <TaskStepMethWrapper object at 0x000001BCFC7D4B00>()>
> File "C:Program FilesPython37libsite-packagesuvicornprotocolshttph11_impl.py", line 388, in run_asgi
result = await app(self.scope, self.receive, self.send)
│ │ │ │ │ │ └ <function RequestResponseCycle.send at 0x000001BCFC757840>
│ │ │ │ │ └ <uvicorn.protocols.http.h11_impl.RequestResponseCycle object at 0x000001BCFC7D4A90>
│ │ │ │ └ <function RequestResponseCycle.receive at 0x000001BCFC7578C8>
│ │ │ └ <uvicorn.protocols.http.h11_impl.RequestResponseCycle object at 0x000001BCFC7D4A90>
│ │ └ {'type': 'http', 'asgi': {'version': '3.0', 'spec_version': '2.1'}, 'http_version': '1.1', 'server': ('127.0.0.1', 80), 'clie...
│ └ <uvicorn.protocols.http.h11_impl.RequestResponseCycle object at 0x000001BCFC7D4A90>
└ <uvicorn.middleware.proxy_headers.ProxyHeadersMiddleware object at 0x000001BCFC722BA8>
File "C:Program FilesPython37libsite-packagesuvicornmiddlewareproxy_headers.py", line 45, in __call__
return await self.app(scope, receive, send)
│ │ │ │ └ <bound method RequestResponseCycle.send of <uvicorn.protocols.http.h11_impl.RequestResponseCycle object at 0x000001BCFC7D4A90>>
│ │ │ └ <bound method RequestResponseCycle.receive of <uvicorn.protocols.http.h11_impl.RequestResponseCycle object at 0x000001BCFC7D4...
│ │ └ {'type': 'http', 'asgi': {'version': '3.0', 'spec_version': '2.1'}, 'http_version': '1.1', 'server': ('127.0.0.1', 80), 'clie...
│ └ <fastapi.applications.FastAPI object at 0x000001BCFC722710>
└ <uvicorn.middleware.proxy_headers.ProxyHeadersMiddleware object at 0x000001BCFC722BA8>
File "C:Program FilesPython37libsite-packagesfastapiapplications.py", line 149, in __call__
await super().__call__(scope, receive, send)
│ │ └ <bound method RequestResponseCycle.send of <uvicorn.protocols.http.h11_impl.RequestResponseCycle object at 0x000001BCFC7D4A90>>
│ └ <bound method RequestResponseCycle.receive of <uvicorn.protocols.http.h11_impl.RequestResponseCycle object at 0x000001BCFC7D4...
└ {'type': 'http', 'asgi': {'version': '3.0', 'spec_version': '2.1'}, 'http_version': '1.1', 'server': ('127.0.0.1', 80), 'clie...
File "C:Program FilesPython37libsite-packagesstarletteapplications.py", line 102, in __call__
await self.middleware_stack(scope, receive, send)
│ │ │ │ └ <bound method RequestResponseCycle.send of <uvicorn.protocols.http.h11_impl.RequestResponseCycle object at 0x000001BCFC7D4A90>>
│ │ │ └ <bound method RequestResponseCycle.receive of <uvicorn.protocols.http.h11_impl.RequestResponseCycle object at 0x000001BCFC7D4...
│ │ └ {'type': 'http', 'asgi': {'version': '3.0', 'spec_version': '2.1'}, 'http_version': '1.1', 'server': ('127.0.0.1', 80), 'clie...
│ └ <starlette.middleware.errors.ServerErrorMiddleware object at 0x000001BCFC7B8FD0>
└ <fastapi.applications.FastAPI object at 0x000001BCFC722710>
File "C:Program FilesPython37libsite-packagesstarlettemiddlewareerrors.py", line 181, in __call__
raise exc from None
File "C:Program FilesPython37libsite-packagesstarlettemiddlewareerrors.py", line 159, in __call__
await self.app(scope, receive, _send)
│ │ │ │ └ <function ServerErrorMiddleware.__call__.<locals>._send at 0x000001BCFC72AE18>
│ │ │ └ <bound method RequestResponseCycle.receive of <uvicorn.protocols.http.h11_impl.RequestResponseCycle object at 0x000001BCFC7D4...
│ │ └ {'type': 'http', 'asgi': {'version': '3.0', 'spec_version': '2.1'}, 'http_version': '1.1', 'server': ('127.0.0.1', 80), 'clie...
│ └ <starlette.middleware.cors.CORSMiddleware object at 0x000001BCFC7B8F60>
└ <starlette.middleware.errors.ServerErrorMiddleware object at 0x000001BCFC7B8FD0>
File "C:Program FilesPython37libsite-packagesstarlettemiddlewarecors.py", line 84, in __call__
await self.simple_response(scope, receive, send, request_headers=headers)
│ │ │ │ │ └ Headers({'host': '127.0.0.1', 'connection': 'keep-alive', 'content-length': '295', 'accept': 'application/json', 'user-agent'...
│ │ │ │ └ <function ServerErrorMiddleware.__call__.<locals>._send at 0x000001BCFC72AE18>
│ │ │ └ <bound method RequestResponseCycle.receive of <uvicorn.protocols.http.h11_impl.RequestResponseCycle object at 0x000001BCFC7D4...
│ │ └ {'type': 'http', 'asgi': {'version': '3.0', 'spec_version': '2.1'}, 'http_version': '1.1', 'server': ('127.0.0.1', 80), 'clie...
│ └ <function CORSMiddleware.simple_response at 0x000001BCEE53DC80>
└ <starlette.middleware.cors.CORSMiddleware object at 0x000001BCFC7B8F60>
File "C:Program FilesPython37libsite-packagesstarlettemiddlewarecors.py", line 140, in simple_response
await self.app(scope, receive, send)
│ │ │ │ └ functools.partial(<bound method CORSMiddleware.send of <starlette.middleware.cors.CORSMiddleware object at 0x000001BCFC7B8F60...
│ │ │ └ <bound method RequestResponseCycle.receive of <uvicorn.protocols.http.h11_impl.RequestResponseCycle object at 0x000001BCFC7D4...
│ │ └ {'type': 'http', 'asgi': {'version': '3.0', 'spec_version': '2.1'}, 'http_version': '1.1', 'server': ('127.0.0.1', 80), 'clie...
│ └ <starlette.exceptions.ExceptionMiddleware object at 0x000001BCFC7B8E48>
└ <starlette.middleware.cors.CORSMiddleware object at 0x000001BCFC7B8F60>
File "C:Program FilesPython37libsite-packagesstarletteexceptions.py", line 82, in __call__
raise exc from None
File "C:Program FilesPython37libsite-packagesstarletteexceptions.py", line 71, in __call__
await self.app(scope, receive, sender)
│ │ │ │ └ <function ExceptionMiddleware.__call__.<locals>.sender at 0x000001BCFC7C18C8>
│ │ │ └ <bound method RequestResponseCycle.receive of <uvicorn.protocols.http.h11_impl.RequestResponseCycle object at 0x000001BCFC7D4...
│ │ └ {'type': 'http', 'asgi': {'version': '3.0', 'spec_version': '2.1'}, 'http_version': '1.1', 'server': ('127.0.0.1', 80), 'clie...
│ └ <fastapi.routing.APIRouter object at 0x000001BCFC7220F0>
└ <starlette.exceptions.ExceptionMiddleware object at 0x000001BCFC7B8E48>
File "C:Program FilesPython37libsite-packagesstarletterouting.py", line 550, in __call__
await route.handle(scope, receive, send)
│ │ │ │ └ <function ExceptionMiddleware.__call__.<locals>.sender at 0x000001BCFC7C18C8>
│ │ │ └ <bound method RequestResponseCycle.receive of <uvicorn.protocols.http.h11_impl.RequestResponseCycle object at 0x000001BCFC7D4...
│ │ └ {'type': 'http', 'asgi': {'version': '3.0', 'spec_version': '2.1'}, 'http_version': '1.1', 'server': ('127.0.0.1', 80), 'clie...
│ └ <function Route.handle at 0x000001BCEE4FF6A8>
└ <fastapi.routing.APIRoute object at 0x000001BCFC7B8E80>
File "C:Program FilesPython37libsite-packagesstarletterouting.py", line 227, in handle
await self.app(scope, receive, send)
│ │ │ │ └ <function ExceptionMiddleware.__call__.<locals>.sender at 0x000001BCFC7C18C8>
│ │ │ └ <bound method RequestResponseCycle.receive of <uvicorn.protocols.http.h11_impl.RequestResponseCycle object at 0x000001BCFC7D4...
│ │ └ {'type': 'http', 'asgi': {'version': '3.0', 'spec_version': '2.1'}, 'http_version': '1.1', 'server': ('127.0.0.1', 80), 'clie...
│ └ <function request_response.<locals>.app at 0x000001BCFC7C1A60>
└ <fastapi.routing.APIRoute object at 0x000001BCFC7B8E80>
File "C:Program FilesPython37libsite-packagesstarletterouting.py", line 41, in app
response = await func(request)
│ └ <starlette.requests.Request object at 0x000001BCFC7D4588>
└ <function get_request_handler.<locals>.app at 0x000001BCFC7C19D8>
File "C:Program FilesPython37libsite-packagesfastapirouting.py", line 213, in app
is_coroutine=is_coroutine,
└ True
File "C:Program FilesPython37libsite-packagesfastapirouting.py", line 113, in serialize_response
exclude_none=exclude_none,
└ False
File "C:Program FilesPython37libsite-packagesfastapirouting.py", line 65, in _prepare_response_content
exclude_none=exclude_none,
└ False
File "pydanticmain.py", line 386, in pydantic.main.BaseModel.dict
File "pydanticmain.py", line 706, in _iter
File "pydanticmain.py", line 623, in pydantic.main.BaseModel._get_value
File "pydanticmain.py", line 623, in pydantic.main.BaseModel._get_value
File "pydanticmain.py", line 623, in pydantic.main.BaseModel._get_value
[Previous line repeated 722 more times]
File "pydanticmain.py", line 605, in pydantic.main.BaseModel._get_value
File "C:Program FilesPython37libabc.py", line 139, in __instancecheck__
return _abc_instancecheck(cls, instance)
│ │ └ 8
│ └ <class 'pydantic.main.BaseModel'>
└ <built-in function _abc_instancecheck>
RecursionError: maximum recursion depth exceeded in comparison```
Answers:
This was a simple issue that was resolved by amending the output response to match the pydantic model
ERROR: Exception in ASGI application
Simply means one or more of the .py files have not been saved before trying to test/run
In my own case, I was referencing a cache key from Redis that hadn’t been created yet.
Description
I’ve seen similar issues about self-referencing Pydantic models causing RecursionError: maximum recursion depth exceeded in comparison but as far as I can tell there are no self-referencing models included in the code. I’m just just using Pydantic’s BaseModel class.
The code runs successfully until the function in audit.py below tries to return the output from the model.
I’ve included the full traceback as I’m not sure where to begin with this error. I’ve run the code with PyCharm and without an IDE and it always produces the traceback below but doesn’t crash the app but returns a http status code of 500 to the front end.
Any advice would be much appreciated.
As suggested I have also tried sys.setrecursionlimit(1500) to increase the recursion limit.
Environment
- OS: Windows 10
- FastAPI Version: 0.61.1
- Pydantic Version: 1.6.1
- Uvicorn Version: 0.11.8
- Python Version: 3.7.1
- Pycharm Version: 2020.2
App
main.py
import uvicorn
from fastapi import FastAPI
from starlette.middleware.cors import CORSMiddleware
from app.api.routes.router import api_router
from app.core.logging import init_logging
from app.core.config import settings
init_logging()
def get_app() -> FastAPI:
application = FastAPI(title=settings.APP_NAME, version=settings.APP_VERSION, debug=settings.DEBUG)
if settings.BACKEND_CORS_ORIGINS:
# middleware support for cors
application.add_middleware(
CORSMiddleware,
allow_origins=[str(origin) for origin in settings.BACKEND_CORS_ORIGINS],
allow_credentials=True,
allow_methods=["*"],
allow_headers=["*"],
)
application.include_router(api_router, prefix=settings.API_V1_STR)
return application
app = get_app()
if __name__ == "__main__":
uvicorn.run("main:app", host="127.0.0.1", port=80)
router.py
from fastapi import APIRouter
from app.api.routes import audit
api_router = APIRouter()
api_router.include_router(audit.router, tags=["audit"], prefix="/audit")
audit.py
import validators
from fastapi import APIRouter, HTTPException
from loguru import logger
from app.api.dependencies.audit import analyzer
from app.schemas.audit import AuditPayload, AuditResult
router = APIRouter()
@router.post("/", response_model=AuditResult, name="audit", status_code=200)
async def post_audit(payload: AuditPayload) -> AuditResult:
logger.info("Audit request received")
# validate URL
try:
logger.info("Validating URL")
validators.url(payload.url)
except HTTPException:
HTTPException(status_code=404, detail="Invalid URL.")
logger.exception("HTTPException - Invalid URL")
# generate output from route audit.py
logger.info("Running audit analysis. This could take up to 10 minutes. Maybe grab a coffee...")
analyzed_output = analyzer.analyze(url=payload.url,
brand=payload.brand,
twitter_screen_name=payload.twitter_screen_name,
facebook_page_name=payload.facebook_page_name,
instagram_screen_name=payload.instagram_screen_name,
youtube_user_name=payload.youtube_user_name,
ignore_robots=payload.ignore_robots,
ignore_sitemap=payload.ignore_sitemap,
google_analytics_view_id=payload.google_analytics_view_id)
output = AuditResult(**analyzed_output)
return output
audit_models.py
from pydantic import BaseModel
class AuditPayload(BaseModel):
url: str
brand: str
twitter_screen_name: str
facebook_page_name: str
instagram_screen_name: str
youtube_user_name: str
ignore_robots: bool
ignore_sitemap: bool
google_analytics_view_id: str
class AuditResult(BaseModel):
base_url: str
run_time: float
website_404: dict
website_302: dict
website_h1_tags: dict
website_duplicate_h1: dict
website_h2_tags: dict
website_page_duplications: dict
website_page_similarities: dict
website_page_desc_duplications: dict
website_page_title_duplications: dict
pages: list
pages_out_links_404: dict = None
pages_canonicals: dict
seo_phrases: dict
social: dict
google_analytics_report: dict
google_psi_desktop: dict
google_psi_mobile: dict
google_algo_updates: dict
google_sb: list
robots_txt: list
This line throws the error in the logs:
2020-09-10 10:02:31.483 | ERROR | uvicorn.protocols.http.h11_impl:run_asgi:391 – Exception in ASGI application
I believe this bit is the most relevant to understanding why this error is occuring:
File "pydanticmain.py", line 623, in pydantic.main.BaseModel._get_value
[Previous line repeated 722 more times]
Full traceback:
Traceback (most recent call last):
File "C:Users<user>AppDataLocalJetBrainsToolboxappsPyCharm-Pch-0202.6948.78pluginspythonhelperspydevpydevconsole.py", line 483, in <module>
pydevconsole.start_client(host, port)
│ │ │ └ 50488
│ │ └ '127.0.0.1'
│ └ <function start_client at 0x000001BCEDC19D08>
└ <module 'pydevconsole' from 'C:\Users\<user>\AppData\Local\JetBrains\Toolbox\apps\PyCharm-P\ch-0\202.6948.78\pl...
File "C:Users<user>AppDataLocalJetBrainsToolboxappsPyCharm-Pch-0202.6948.78pluginspythonhelperspydevpydevconsole.py", line 411, in start_client
process_exec_queue(interpreter)
│ └ <_pydev_bundle.pydev_ipython_console.InterpreterInterface object at 0x000001BCEDC1BF98>
└ <function process_exec_queue at 0x000001BCEDC19A60>
File "C:Users<user>AppDataLocalJetBrainsToolboxappsPyCharm-Pch-0202.6948.78pluginspythonhelperspydevpydevconsole.py", line 258, in process_exec_queue
more = interpreter.add_exec(code_fragment)
│ │ └ <_pydev_bundle.pydev_console_types.CodeFragment object at 0x000001BCEDCFE748>
│ └ <function BaseCodeExecutor.add_exec at 0x000001BCECF38488>
└ <_pydev_bundle.pydev_ipython_console.InterpreterInterface object at 0x000001BCEDC1BF98>
File "C:Users<user>AppDataLocalJetBrainsToolboxappsPyCharm-Pch-0202.6948.78pluginspythonhelperspydev_pydev_bundlepydev_code_executor.py", line 106, in add_exec
more = self.do_add_exec(code_fragment)
│ │ └ <_pydev_bundle.pydev_console_types.CodeFragment object at 0x000001BCEDCFE748>
│ └ <function InterpreterInterface.do_add_exec at 0x000001BCEDC15D90>
└ <_pydev_bundle.pydev_ipython_console.InterpreterInterface object at 0x000001BCEDC1BF98>
File "C:Users<user>AppDataLocalJetBrainsToolboxappsPyCharm-Pch-0202.6948.78pluginspythonhelperspydev_pydev_bundlepydev_ipython_console.py", line 36, in do_add_exec
res = bool(self.interpreter.add_exec(code_fragment.text))
│ │ │ │ └ "runfile('E:/Users/<user>/Documents/GitHub/HawkSense/backend/app/app/main.py', wdir='E:/Users/<user>/Docume...
│ │ │ └ <_pydev_bundle.pydev_console_types.CodeFragment object at 0x000001BCEDCFE748>
│ │ └ <function _PyDevFrontEnd.add_exec at 0x000001BCEDC15A60>
│ └ <_pydev_bundle.pydev_ipython_console_011._PyDevFrontEnd object at 0x000001BCEDC350B8>
└ <_pydev_bundle.pydev_ipython_console.InterpreterInterface object at 0x000001BCEDC1BF98>
File "C:Users<user>AppDataLocalJetBrainsToolboxappsPyCharm-Pch-0202.6948.78pluginspythonhelperspydev_pydev_bundlepydev_ipython_console_011.py", line 483, in add_exec
self.ipython.run_cell(line, store_history=True)
│ │ │ └ "runfile('E:/Users/<user>/Documents/GitHub/HawkSense/backend/app/app/main.py', wdir='E:/Users/<user>/Docume...
│ │ └ <function InteractiveShell.run_cell at 0x000001BCED5E7268>
│ └ <_pydev_bundle.pydev_ipython_console_011.PyDevTerminalInteractiveShell object at 0x000001BCEDC350F0>
└ <_pydev_bundle.pydev_ipython_console_011._PyDevFrontEnd object at 0x000001BCEDC350B8>
File "C:Program FilesPython37libsite-packagesIPythoncoreinteractiveshell.py", line 2843, in run_cell
raw_cell, store_history, silent, shell_futures)
│ │ │ └ True
│ │ └ False
│ └ True
└ "runfile('E:/Users/<user>/Documents/GitHub/HawkSense/backend/app/app/main.py', wdir='E:/Users/<user>/Docume...
File "C:Program FilesPython37libsite-packagesIPythoncoreinteractiveshell.py", line 2869, in _run_cell
return runner(coro)
│ └ <generator object InteractiveShell.run_cell_async at 0x000001BCEDC49C78>
└ <function _pseudo_sync_runner at 0x000001BCED5D0C80>
File "C:Program FilesPython37libsite-packagesIPythoncoreasync_helpers.py", line 67, in _pseudo_sync_runner
coro.send(None)
│ └ <method 'send' of 'generator' objects>
└ <generator object InteractiveShell.run_cell_async at 0x000001BCEDC49C78>
File "C:Program FilesPython37libsite-packagesIPythoncoreinteractiveshell.py", line 3044, in run_cell_async
interactivity=interactivity, compiler=compiler, result=result)
│ │ └ <ExecutionResult object at 1bcedcd3470, execution_count=2 error_before_exec=None error_in_exec=None info=<ExecutionInfo objec...
│ └ <IPython.core.compilerop.CachingCompiler object at 0x000001BCEDC356D8>
└ 'last_expr'
File "C:Program FilesPython37libsite-packagesIPythoncoreinteractiveshell.py", line 3215, in run_ast_nodes
if (yield from self.run_code(code, result)):
│ │ │ └ <ExecutionResult object at 1bcedcd3470, execution_count=2 error_before_exec=None error_in_exec=None info=<ExecutionInfo objec...
│ │ └ <code object <module> at 0x000001BCEDCDADB0, file "<ipython-input-2-086756a0f1dd>", line 1>
│ └ <function InteractiveShell.run_code at 0x000001BCED5E76A8>
└ <_pydev_bundle.pydev_ipython_console_011.PyDevTerminalInteractiveShell object at 0x000001BCEDC350F0>
File "C:Program FilesPython37libsite-packagesIPythoncoreinteractiveshell.py", line 3291, in run_code
exec(code_obj, self.user_global_ns, self.user_ns)
│ │ │ │ └ {'__name__': 'pydev_umd', '__doc__': 'Automatically created module for IPython interactive environment', '__package__': None,...
│ │ │ └ <_pydev_bundle.pydev_ipython_console_011.PyDevTerminalInteractiveShell object at 0x000001BCEDC350F0>
│ │ └ <property object at 0x000001BCED5D8958>
│ └ <_pydev_bundle.pydev_ipython_console_011.PyDevTerminalInteractiveShell object at 0x000001BCEDC350F0>
└ <code object <module> at 0x000001BCEDCDADB0, file "<ipython-input-2-086756a0f1dd>", line 1>
File "<ipython-input-2-086756a0f1dd>", line 1, in <module>
runfile('E:/Users/<user>/Documents/GitHub/HawkSense/backend/app/app/main.py', wdir='E:/Users/<user>/Documents/GitHub/HawkSense/backend/app/app')
File "C:Users<user>AppDataLocalJetBrainsToolboxappsPyCharm-Pch-0202.6948.78pluginspythonhelperspydev_pydev_bundlepydev_umd.py", line 197, in runfile
pydev_imports.execfile(filename, global_vars, local_vars) # execute the script
│ │ │ │ └ {'__name__': '__main__', '__doc__': "nMain entry point into API for endpoints related to HawkSense's main functionality.nto...
│ │ │ └ {'__name__': '__main__', '__doc__': "nMain entry point into API for endpoints related to HawkSense's main functionality.nto...
│ │ └ 'E:/Users/<user>/Documents/GitHub/HawkSense/backend/app/app/main.py'
│ └ <function execfile at 0x000001BCECC521E0>
└ <module '_pydev_bundle.pydev_imports' from 'C:\Users\<user>\AppData\Local\JetBrains\Toolbox\apps\PyCharm-P\ch-0\...
File "C:Users<user>AppDataLocalJetBrainsToolboxappsPyCharm-Pch-0202.6948.78pluginspythonhelperspydev_pydev_imps_pydev_execfile.py", line 18, in execfile
exec(compile(contents+"n", file, 'exec'), glob, loc)
│ │ │ └ {'__name__': '__main__', '__doc__': "nMain entry point into API for endpoints related to HawkSense's main functionality.nto...
│ │ └ {'__name__': '__main__', '__doc__': "nMain entry point into API for endpoints related to HawkSense's main functionality.nto...
│ └ 'E:/Users/<user>/Documents/GitHub/HawkSense/backend/app/app/main.py'
└ '#!/usr/bin/env pythonnn"""nMain entry point into API for endpoints related to HawkSense's main functionality.ntodo: htt...
File "E:/Users/<user>/Documents/GitHub/HawkSense/backend/app/appmain.py", line 47, in <module>
uvicorn.run("main:app", host="127.0.0.1", port=80) # for debug only
│ └ <function run at 0x000001BCEDE041E0>
└ <module 'uvicorn' from 'C:\Program Files\Python37\lib\site-packages\uvicorn\__init__.py'>
File "C:Program FilesPython37libsite-packagesuvicornmain.py", line 362, in run
server.run()
│ └ <function Server.run at 0x000001BCEDE4B510>
└ <uvicorn.main.Server object at 0x000001BCFC722198>
File "C:Program FilesPython37libsite-packagesuvicornmain.py", line 390, in run
loop.run_until_complete(self.serve(sockets=sockets))
│ │ │ │ └ None
│ │ │ └ <function Server.serve at 0x000001BCEDE4B598>
│ │ └ <uvicorn.main.Server object at 0x000001BCFC722198>
│ └ <function BaseEventLoop.run_until_complete at 0x000001BCED49FE18>
└ <_WindowsSelectorEventLoop running=True closed=False debug=False>
File "C:Program FilesPython37libasynciobase_events.py", line 560, in run_until_complete
self.run_forever()
│ └ <function BaseEventLoop.run_forever at 0x000001BCED49FD90>
└ <_WindowsSelectorEventLoop running=True closed=False debug=False>
File "C:Program FilesPython37libasynciobase_events.py", line 528, in run_forever
self._run_once()
│ └ <function BaseEventLoop._run_once at 0x000001BCED4A27B8>
└ <_WindowsSelectorEventLoop running=True closed=False debug=False>
File "C:Program FilesPython37libasynciobase_events.py", line 1764, in _run_once
handle._run()
│ └ <function Handle._run at 0x000001BCED43AB70>
└ <Handle <TaskStepMethWrapper object at 0x000001BCFC7D4B00>()>
File "C:Program FilesPython37libasyncioevents.py", line 88, in _run
self._context.run(self._callback, *self._args)
│ │ │ │ │ └ <member '_args' of 'Handle' objects>
│ │ │ │ └ <Handle <TaskStepMethWrapper object at 0x000001BCFC7D4B00>()>
│ │ │ └ <member '_callback' of 'Handle' objects>
│ │ └ <Handle <TaskStepMethWrapper object at 0x000001BCFC7D4B00>()>
│ └ <member '_context' of 'Handle' objects>
└ <Handle <TaskStepMethWrapper object at 0x000001BCFC7D4B00>()>
> File "C:Program FilesPython37libsite-packagesuvicornprotocolshttph11_impl.py", line 388, in run_asgi
result = await app(self.scope, self.receive, self.send)
│ │ │ │ │ │ └ <function RequestResponseCycle.send at 0x000001BCFC757840>
│ │ │ │ │ └ <uvicorn.protocols.http.h11_impl.RequestResponseCycle object at 0x000001BCFC7D4A90>
│ │ │ │ └ <function RequestResponseCycle.receive at 0x000001BCFC7578C8>
│ │ │ └ <uvicorn.protocols.http.h11_impl.RequestResponseCycle object at 0x000001BCFC7D4A90>
│ │ └ {'type': 'http', 'asgi': {'version': '3.0', 'spec_version': '2.1'}, 'http_version': '1.1', 'server': ('127.0.0.1', 80), 'clie...
│ └ <uvicorn.protocols.http.h11_impl.RequestResponseCycle object at 0x000001BCFC7D4A90>
└ <uvicorn.middleware.proxy_headers.ProxyHeadersMiddleware object at 0x000001BCFC722BA8>
File "C:Program FilesPython37libsite-packagesuvicornmiddlewareproxy_headers.py", line 45, in __call__
return await self.app(scope, receive, send)
│ │ │ │ └ <bound method RequestResponseCycle.send of <uvicorn.protocols.http.h11_impl.RequestResponseCycle object at 0x000001BCFC7D4A90>>
│ │ │ └ <bound method RequestResponseCycle.receive of <uvicorn.protocols.http.h11_impl.RequestResponseCycle object at 0x000001BCFC7D4...
│ │ └ {'type': 'http', 'asgi': {'version': '3.0', 'spec_version': '2.1'}, 'http_version': '1.1', 'server': ('127.0.0.1', 80), 'clie...
│ └ <fastapi.applications.FastAPI object at 0x000001BCFC722710>
└ <uvicorn.middleware.proxy_headers.ProxyHeadersMiddleware object at 0x000001BCFC722BA8>
File "C:Program FilesPython37libsite-packagesfastapiapplications.py", line 149, in __call__
await super().__call__(scope, receive, send)
│ │ └ <bound method RequestResponseCycle.send of <uvicorn.protocols.http.h11_impl.RequestResponseCycle object at 0x000001BCFC7D4A90>>
│ └ <bound method RequestResponseCycle.receive of <uvicorn.protocols.http.h11_impl.RequestResponseCycle object at 0x000001BCFC7D4...
└ {'type': 'http', 'asgi': {'version': '3.0', 'spec_version': '2.1'}, 'http_version': '1.1', 'server': ('127.0.0.1', 80), 'clie...
File "C:Program FilesPython37libsite-packagesstarletteapplications.py", line 102, in __call__
await self.middleware_stack(scope, receive, send)
│ │ │ │ └ <bound method RequestResponseCycle.send of <uvicorn.protocols.http.h11_impl.RequestResponseCycle object at 0x000001BCFC7D4A90>>
│ │ │ └ <bound method RequestResponseCycle.receive of <uvicorn.protocols.http.h11_impl.RequestResponseCycle object at 0x000001BCFC7D4...
│ │ └ {'type': 'http', 'asgi': {'version': '3.0', 'spec_version': '2.1'}, 'http_version': '1.1', 'server': ('127.0.0.1', 80), 'clie...
│ └ <starlette.middleware.errors.ServerErrorMiddleware object at 0x000001BCFC7B8FD0>
└ <fastapi.applications.FastAPI object at 0x000001BCFC722710>
File "C:Program FilesPython37libsite-packagesstarlettemiddlewareerrors.py", line 181, in __call__
raise exc from None
File "C:Program FilesPython37libsite-packagesstarlettemiddlewareerrors.py", line 159, in __call__
await self.app(scope, receive, _send)
│ │ │ │ └ <function ServerErrorMiddleware.__call__.<locals>._send at 0x000001BCFC72AE18>
│ │ │ └ <bound method RequestResponseCycle.receive of <uvicorn.protocols.http.h11_impl.RequestResponseCycle object at 0x000001BCFC7D4...
│ │ └ {'type': 'http', 'asgi': {'version': '3.0', 'spec_version': '2.1'}, 'http_version': '1.1', 'server': ('127.0.0.1', 80), 'clie...
│ └ <starlette.middleware.cors.CORSMiddleware object at 0x000001BCFC7B8F60>
└ <starlette.middleware.errors.ServerErrorMiddleware object at 0x000001BCFC7B8FD0>
File "C:Program FilesPython37libsite-packagesstarlettemiddlewarecors.py", line 84, in __call__
await self.simple_response(scope, receive, send, request_headers=headers)
│ │ │ │ │ └ Headers({'host': '127.0.0.1', 'connection': 'keep-alive', 'content-length': '295', 'accept': 'application/json', 'user-agent'...
│ │ │ │ └ <function ServerErrorMiddleware.__call__.<locals>._send at 0x000001BCFC72AE18>
│ │ │ └ <bound method RequestResponseCycle.receive of <uvicorn.protocols.http.h11_impl.RequestResponseCycle object at 0x000001BCFC7D4...
│ │ └ {'type': 'http', 'asgi': {'version': '3.0', 'spec_version': '2.1'}, 'http_version': '1.1', 'server': ('127.0.0.1', 80), 'clie...
│ └ <function CORSMiddleware.simple_response at 0x000001BCEE53DC80>
└ <starlette.middleware.cors.CORSMiddleware object at 0x000001BCFC7B8F60>
File "C:Program FilesPython37libsite-packagesstarlettemiddlewarecors.py", line 140, in simple_response
await self.app(scope, receive, send)
│ │ │ │ └ functools.partial(<bound method CORSMiddleware.send of <starlette.middleware.cors.CORSMiddleware object at 0x000001BCFC7B8F60...
│ │ │ └ <bound method RequestResponseCycle.receive of <uvicorn.protocols.http.h11_impl.RequestResponseCycle object at 0x000001BCFC7D4...
│ │ └ {'type': 'http', 'asgi': {'version': '3.0', 'spec_version': '2.1'}, 'http_version': '1.1', 'server': ('127.0.0.1', 80), 'clie...
│ └ <starlette.exceptions.ExceptionMiddleware object at 0x000001BCFC7B8E48>
└ <starlette.middleware.cors.CORSMiddleware object at 0x000001BCFC7B8F60>
File "C:Program FilesPython37libsite-packagesstarletteexceptions.py", line 82, in __call__
raise exc from None
File "C:Program FilesPython37libsite-packagesstarletteexceptions.py", line 71, in __call__
await self.app(scope, receive, sender)
│ │ │ │ └ <function ExceptionMiddleware.__call__.<locals>.sender at 0x000001BCFC7C18C8>
│ │ │ └ <bound method RequestResponseCycle.receive of <uvicorn.protocols.http.h11_impl.RequestResponseCycle object at 0x000001BCFC7D4...
│ │ └ {'type': 'http', 'asgi': {'version': '3.0', 'spec_version': '2.1'}, 'http_version': '1.1', 'server': ('127.0.0.1', 80), 'clie...
│ └ <fastapi.routing.APIRouter object at 0x000001BCFC7220F0>
└ <starlette.exceptions.ExceptionMiddleware object at 0x000001BCFC7B8E48>
File "C:Program FilesPython37libsite-packagesstarletterouting.py", line 550, in __call__
await route.handle(scope, receive, send)
│ │ │ │ └ <function ExceptionMiddleware.__call__.<locals>.sender at 0x000001BCFC7C18C8>
│ │ │ └ <bound method RequestResponseCycle.receive of <uvicorn.protocols.http.h11_impl.RequestResponseCycle object at 0x000001BCFC7D4...
│ │ └ {'type': 'http', 'asgi': {'version': '3.0', 'spec_version': '2.1'}, 'http_version': '1.1', 'server': ('127.0.0.1', 80), 'clie...
│ └ <function Route.handle at 0x000001BCEE4FF6A8>
└ <fastapi.routing.APIRoute object at 0x000001BCFC7B8E80>
File "C:Program FilesPython37libsite-packagesstarletterouting.py", line 227, in handle
await self.app(scope, receive, send)
│ │ │ │ └ <function ExceptionMiddleware.__call__.<locals>.sender at 0x000001BCFC7C18C8>
│ │ │ └ <bound method RequestResponseCycle.receive of <uvicorn.protocols.http.h11_impl.RequestResponseCycle object at 0x000001BCFC7D4...
│ │ └ {'type': 'http', 'asgi': {'version': '3.0', 'spec_version': '2.1'}, 'http_version': '1.1', 'server': ('127.0.0.1', 80), 'clie...
│ └ <function request_response.<locals>.app at 0x000001BCFC7C1A60>
└ <fastapi.routing.APIRoute object at 0x000001BCFC7B8E80>
File "C:Program FilesPython37libsite-packagesstarletterouting.py", line 41, in app
response = await func(request)
│ └ <starlette.requests.Request object at 0x000001BCFC7D4588>
└ <function get_request_handler.<locals>.app at 0x000001BCFC7C19D8>
File "C:Program FilesPython37libsite-packagesfastapirouting.py", line 213, in app
is_coroutine=is_coroutine,
└ True
File "C:Program FilesPython37libsite-packagesfastapirouting.py", line 113, in serialize_response
exclude_none=exclude_none,
└ False
File "C:Program FilesPython37libsite-packagesfastapirouting.py", line 65, in _prepare_response_content
exclude_none=exclude_none,
└ False
File "pydanticmain.py", line 386, in pydantic.main.BaseModel.dict
File "pydanticmain.py", line 706, in _iter
File "pydanticmain.py", line 623, in pydantic.main.BaseModel._get_value
File "pydanticmain.py", line 623, in pydantic.main.BaseModel._get_value
File "pydanticmain.py", line 623, in pydantic.main.BaseModel._get_value
[Previous line repeated 722 more times]
File "pydanticmain.py", line 605, in pydantic.main.BaseModel._get_value
File "C:Program FilesPython37libabc.py", line 139, in __instancecheck__
return _abc_instancecheck(cls, instance)
│ │ └ 8
│ └ <class 'pydantic.main.BaseModel'>
└ <built-in function _abc_instancecheck>
RecursionError: maximum recursion depth exceeded in comparison```
This was a simple issue that was resolved by amending the output response to match the pydantic model
ERROR: Exception in ASGI application
Simply means one or more of the .py files have not been saved before trying to test/run
In my own case, I was referencing a cache key from Redis that hadn’t been created yet.